package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /*
    1. 添加购物车
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 判断当前要加入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        // 获取当前登录的userId
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        // 如果存在，只需要将数量+1
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1); // update语句
            shoppingCartMapper.updateNumberById(cart);
        }else {
            // 如果不存在，需要插入数据
            // 判断本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                // 本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                // 本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /*
    2.查看购物车
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart cart = ShoppingCart.builder()
                .userId(currentId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(cart);
        return list;
    }
    /*
    3.清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.cleanByUserId(userId);
    }
    /*
    4.删除购物车中的一个商品
     */

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        // 构建当前登录用户的购物车对象
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        // 根据菜品id或者套餐id查询到当前这一条记录
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list != null && list.size() > 0){
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            if(number == 1){
                // 当份数为1时，直接删除当前记录
                shoppingCartMapper.deleteById(cart.getId());
            }else {
                // 不为1，修改份数即可
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
            }
        }


    }
}
